Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764519AbZFQKdP (ORCPT ); Wed, 17 Jun 2009 06:33:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759625AbZFQKc7 (ORCPT ); Wed, 17 Jun 2009 06:32:59 -0400 Received: from hera.kernel.org ([140.211.167.34]:38177 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1763296AbZFQKc5 (ORCPT ); Wed, 17 Jun 2009 06:32:57 -0400 Date: Wed, 17 Jun 2009 10:32:17 GMT From: tip-bot for Mike Galbraith To: linux-tip-commits@vger.kernel.org Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@redhat.com, peterz@infradead.org, efault@gmx.de, lennart@poettering.net, tglx@linutronix.de, mingo@elte.hu Reply-To: mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org, efault@gmx.de, peterz@infradead.org, lennart@poettering.net, tglx@linutronix.de, mingo@elte.hu In-Reply-To: <1245143108.6038.10.camel@marge.simson.net> References: <1245143108.6038.10.camel@marge.simson.net> Subject: [tip:sched/core] sched: Introduce SCHED_RESET_ON_FORK scheduling policy flag, fix Message-ID: Git-Commit-ID: e53438963eacc5624b61293f64e9f93c71f71198 X-Mailer: tip-git-log-daemon MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.0 (hera.kernel.org [127.0.0.1]); Wed, 17 Jun 2009 10:32:18 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2849 Lines: 87 Commit-ID: e53438963eacc5624b61293f64e9f93c71f71198 Gitweb: http://git.kernel.org/tip/e53438963eacc5624b61293f64e9f93c71f71198 Author: Mike Galbraith AuthorDate: Tue, 16 Jun 2009 11:05:08 +0200 Committer: Ingo Molnar CommitDate: Wed, 17 Jun 2009 09:01:51 +0200 sched: Introduce SCHED_RESET_ON_FORK scheduling policy flag, fix Make SCHED_RESET_ON_FORK to DTRT for reniced tasks, and make the sched_fork() SCHED_RESET_ON_FORK bits a self-contained unlikely code block. Signed-off-by: Mike Galbraith Acked-by: Lennart Poettering Cc: Peter Zijlstra LKML-Reference: <1245143108.6038.10.camel@marge.simson.net> Signed-off-by: Ingo Molnar kernel/sched.c | 41 ++++++++++++++++++++++++----------------- 1 file changed, 24 insertions(+), 17 deletions(-) --- kernel/sched.c | 39 +++++++++++++++++++++++---------------- 1 files changed, 23 insertions(+), 16 deletions(-) diff --git a/kernel/sched.c b/kernel/sched.c index 32e6ede..34f9424 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -2613,28 +2613,35 @@ void sched_fork(struct task_struct *p, int clone_flags) set_task_cpu(p, cpu); /* - * Revert to default priority/policy on fork if requested. Make sure we - * do not leak PI boosting priority to the child. + * Make sure we do not leak PI boosting priority to the child. */ - if (current->sched_reset_on_fork && - (p->policy == SCHED_FIFO || p->policy == SCHED_RR)) - p->policy = SCHED_NORMAL; + p->prio = current->normal_prio; - if (current->sched_reset_on_fork && - (current->normal_prio < DEFAULT_PRIO)) - p->prio = DEFAULT_PRIO; - else - p->prio = current->normal_prio; + /* + * Revert to default priority/policy on fork if requested. + */ + if (unlikely(p->sched_reset_on_fork)) { + if (p->policy == SCHED_FIFO || p->policy == SCHED_RR) + p->policy = SCHED_NORMAL; + + if (p->normal_prio < DEFAULT_PRIO) + p->prio = DEFAULT_PRIO; + + if (PRIO_TO_NICE(p->static_prio) < 0) { + p->static_prio = NICE_TO_PRIO(0); + set_load_weight(p); + } + + /* + * We don't need the reset flag anymore after the fork. It has + * fulfilled its duty: + */ + p->sched_reset_on_fork = 0; + } if (!rt_prio(p->prio)) p->sched_class = &fair_sched_class; - /* - * We don't need the reset flag anymore after the fork. It has - * fulfilled its duty: - */ - p->sched_reset_on_fork = 0; - #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) if (likely(sched_info_on())) memset(&p->sched_info, 0, sizeof(p->sched_info)); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/